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7 results for: plumb-bob

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Fig 1: Illustration showing Parabolic trajectory and trajectory board with adjusting screws
ARP23A16_031

Fig 1: Illustration showing Parabolic trajectory a...

The use of a plumb-bob to keep a dry stone wall vertical as it is built
ARP23A16_064

The use of a plumb-bob to keep a dry stone wall ve...

Using a quadrant with a plumb bob to calculate the height of a tower by triangulation
ARP15A00_384

Using a quadrant with a plumb bob to calculate the...

Using a quadrant with a plumb bob
ARP07110_460001106

Using a quadrant with a plumb bob

Surveyors using quadrants fitted with plumb bobs
ARP07103_460000604

Surveyors using quadrants fitted with plumb bobs

Hevelius observing through refracting telescope
ARP07104_460001482

Hevelius observing through refracting telescope

Using a quadrant with a plumb bob to calculate the height of a tower by triangulation
ARP07105_460001573

Using a quadrant with a plumb bob to calculate the...